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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37798    
Entity Registrant Name Cartesian Therapeutics, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-1622110    
Entity Address, Address Line One 7495 New Horizon Way    
Entity Address, City or Town Frederick    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 21703    
City Area Code 301    
Local Phone Number 348-8698    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol RNAC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Smaller Reporting Company true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 193,901,954
Entity Common Stock, Shares Outstanding   25,907,101  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement relating to its 2025 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001453687